add info about public/local deploy

Author: kmurphypolygon

docs/cdk/get-started/deploy-validium.md

@@ -9,12 +9,19 @@ Follow the steps below to deploy a CDK validium instance.
 
 ## 1. Deploy validium-specific contracts
 
+!!! important
+    - Follow this step if you are deploying to a public testnet.
+    - For a local deploy, follow step 2 instead which deploys a local L1 network plus CDK contracts.
+
 First, deploy the relevant contracts.
 
 Follow the steps in the [CDK validium contracts repository's README](https://github.com/0xPolygon/cdk-validium-contracts).
 
 ## 2. Run the CDK validium node
 
+!!! important
+    - If you are deploying to a public testnet, follow the previous step 1.
+
 Next, set up and run the CDK validium node.
 
 Follow the instructions in the [CDK validium node repository's README](https://github.com/0xPolygon/cdk-validium-node).